package com.example.administrator.freshlistview.Views;

import java.text.SimpleDateFormat;
import java.util.Date;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.example.administrator.freshlistview.R;

public class RefreshListView extends ListView implements AbsListView.OnScrollListener {

	private View headerView;//headerView
	private ImageView iv_arrow;
	private ProgressBar pb_rotate;
	private TextView tv_state,tv_time;
	private View footerView;
	private int footerViewHeight;
	
	private int headerViewHeight;//headerView高
	
	private int downY;//按下时y坐标
	
	private final int PULL_REFRESH = 0;//下拉刷新的状态
	private final int RELEASE_REFRESH = 1;//松开刷新的状态
	private final int REFRESHING = 2;//正在刷新的状态
	private int currentState = PULL_REFRESH;
	
	private RotateAnimation upAnimation,downAnimation;
	
	private boolean isLoadingMore = false;//当前是否正在处于加载更多

	public RefreshListView(Context context) {
		super(context);
		init();
	}

	public RefreshListView(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}
	
	private void init(){
		setOnScrollListener(this);
		initHeaderView();
		initRotateAnimation();
		initFooterView();
	}


	/**
	 * 初始化headerView
	 */
	private void initHeaderView() {
		headerView = View.inflate(getContext(), R.layout.layout_header, null);
		iv_arrow = (ImageView) headerView.findViewById(R.id.iv_arrow);
		pb_rotate = (ProgressBar) headerView.findViewById(R.id.pb_rotate);
		tv_state = (TextView) headerView.findViewById(R.id.tv_state);
		tv_time = (TextView) headerView.findViewById(R.id.tv_time);
		
		headerView.measure(0, 0);//主动通知系统去测量该view;
		headerViewHeight = headerView.getMeasuredHeight();
		headerView.setPadding(0, -headerViewHeight, 0, 0);
		
		addHeaderView(headerView);
	}
	
	/**
	 * 初始化旋转动画
	 */
	private void initRotateAnimation() {
		upAnimation = new RotateAnimation(0, -180, 
				RotateAnimation.RELATIVE_TO_SELF, 0.5f,
				RotateAnimation.RELATIVE_TO_SELF, 0.5f);
		upAnimation.setDuration(300);
		upAnimation.setFillAfter(true);
		downAnimation = new RotateAnimation(-180, -360, 
				RotateAnimation.RELATIVE_TO_SELF, 0.5f,
				RotateAnimation.RELATIVE_TO_SELF, 0.5f);
		downAnimation.setDuration(300);
		downAnimation.setFillAfter(true);
	}
	
	private void initFooterView() {
		footerView = View.inflate(getContext(), R.layout.layout_footer, null);
		footerView.measure(0, 0);//主动通知系统去测量该view;
		footerViewHeight = footerView.getMeasuredHeight();
		footerView.setPadding(0, -footerViewHeight, 0, 0);
		addFooterView(footerView);
	}
	
	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		switch (ev.getAction()) {
		case MotionEvent.ACTION_DOWN:
			downY = (int) ev.getY();
			break;
		case MotionEvent.ACTION_MOVE:
			
			if(currentState==REFRESHING){
				break;
			}
			
			int deltaY = (int) (ev.getY() - downY);
			
			int paddingTop = -headerViewHeight + deltaY;
			if(paddingTop>-headerViewHeight && getFirstVisiblePosition()==0){
				headerView.setPadding(0, paddingTop, 0, 0);
//				Log.e("RefreshListView", "paddingTop: "+paddingTop);
				
				if(paddingTop>=0 && currentState==PULL_REFRESH){
					//从下拉刷新进入松开刷新状态
					currentState = RELEASE_REFRESH;
					refreshHeaderView();
				}else if (paddingTop<0 && currentState==RELEASE_REFRESH) {
					//进入下拉刷新状态
					currentState = PULL_REFRESH;
					refreshHeaderView();
				}
				
				
				return true;//拦截TouchMove，不让listview处理该次move事件,会造成listview无法滑动
			}
			
			
			break;
		case MotionEvent.ACTION_UP:
			if(currentState==PULL_REFRESH){
				//隐藏headerView
				headerView.setPadding(0, -headerViewHeight, 0, 0);
			}else if (currentState==RELEASE_REFRESH) {
				headerView.setPadding(0, 0, 0, 0);
				currentState = REFRESHING;
				refreshHeaderView();
				
				if(listener!=null){
					listener.onPullRefresh();
				}
			}
			break;
		}
		return super.onTouchEvent(ev);
	}
	
	/**
	 * 根据currentState来更新headerView
	 */
	private void refreshHeaderView(){
		switch (currentState) {
		case PULL_REFRESH:
			tv_state.setText("下拉刷新");
			iv_arrow.startAnimation(downAnimation);
			break;
		case RELEASE_REFRESH:
			tv_state.setText("松开刷新");
			iv_arrow.startAnimation(upAnimation);
			break;
		case REFRESHING:
			iv_arrow.clearAnimation();//因为向上的旋转动画有可能没有执行完
			iv_arrow.setVisibility(View.INVISIBLE);
			pb_rotate.setVisibility(View.VISIBLE);
			tv_state.setText("正在刷新...");
			break;
		}
	}
	
	/**
	 * 完成刷新操作，重置状态,在你获取完数据并更新完adater之后，去在UI线程中调用该方法
	 */
	public void completeRefresh(){
		if(isLoadingMore){
			//重置footerView状态
			footerView.setPadding(0, -footerViewHeight, 0, 0);
			isLoadingMore = false;
		}else {
			//重置headerView状态
			headerView.setPadding(0, -headerViewHeight, 0, 0);
			currentState = PULL_REFRESH;
			pb_rotate.setVisibility(View.INVISIBLE);
			iv_arrow.setVisibility(View.VISIBLE);
			tv_state.setText("下拉刷新");
			tv_time.setText("最后刷新："+getCurrentTime());
		}
	}
	
	/**
	 * 获取当前系统时间，并格式化
	 * @return
	 */
	private String getCurrentTime(){
		SimpleDateFormat format = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
		return format.format(new Date());
	}
	
	private OnRefreshListener listener;
	public void setOnRefreshListener(OnRefreshListener listener){
		this.listener = listener;
	}
	public interface OnRefreshListener{
		void onPullRefresh();
		void onLoadingMore();
	}
	
	/**
	 * SCROLL_STATE_IDLE:闲置状态，就是手指松开
	 * SCROLL_STATE_TOUCH_SCROLL：手指触摸滑动，就是按着来滑动
	 * SCROLL_STATE_FLING：快速滑动后松开
	 */
	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
		if(scrollState==OnScrollListener.SCROLL_STATE_IDLE 
				&& getLastVisiblePosition()==(getCount()-1) &&!isLoadingMore){
			isLoadingMore = true;
			
			footerView.setPadding(0, 0, 0, 0);//显示出footerView
			setSelection(getCount());//让listview最后一条显示出来
			
			if(listener!=null){
				listener.onLoadingMore();
			}
		}
	}
	@Override
	public void onScroll(AbsListView view, int firstVisibleItem,
			int visibleItemCount, int totalItemCount) {
	}

}
